JPH01126042A - Transmission line monitoring system in ring communication system - Google Patents

Abstract

PURPOSE:To monitor the transmission quality in real time regardless of the scale of a system by duplicating the transmission line between communication controllers and comparing the error rate with other adjacent communication controller. CONSTITUTION:A communication controller IN2, for example, folds a data received from a 1st transmission line TL112 to an upperstream communication controller IN1 from a 2nd transmission line TL221 via a loopback circuit 2 and sends the data to a monitoring circuit 5, a branching circuit 10 and an insertion circuit 11 via a synchronizing circuit 4. The monitoring circuit 5 based on the out of synchronizing signal or the like generated by the synchronizing circuit 4 calculates the error rate and sends the result to a comparator 9. On the other hand, a signal folded by the downstream communication controller IN3 is sent to the synchronizing circuit 7 via the reception circuit 6 and the monitoring circuit 8 calculates the error rate and the result is sent to the comparator 9. The comparator 9 compares both to decide the quality of the transmission line.

Description

[Detailed description of the invention] [Table of contents] Overview Industrial field of application Prior art (Figure 6) Problems to be solved by the invention Means for solving the problems (Figure 1) Effects (Figure 1) Figure 1) Embodiment Description of the first embodiment (Figures 2 and 3) Description of the second embodiment (Figure 4) Description of the third embodiment (Figure 5) Effects of the invention [Summary] Multiple communications Regarding a transmission line monitoring method in a ring communication system that monitors the quality of the transmission line in a ring communication system connected in a ring shape through a control bag or a transmission line, the transmission line between communication control devices is duplicated. , the purpose of which is to enable each communication control device to monitor the quality of the transmission path between adjacent communication control devices. The transmission path between the control devices is configured to include duplexed first and second transmission paths with mutually different transmission directions, and the communication control device is configured to provide the first and second transmission paths with mutually different transmission directions, and the communication control device is configured to The signal from the transmission path is configured to be returned to the second transmission path between the adjacent communication control device, and the signal from the first transmission path between the adjacent communication control device; The quality of the transmission path between the communication control devices is monitored by comparing the error rate with the signal from the second transmission path between the communication control device and another adjacent communication control device.

[Industrial Field of Application] The present invention relates to transmission path monitoring in a ring communication system in which a plurality of communication control devices are connected in a ring shape via transmission paths, for monitoring the quality of the transmission path. Regarding the method.

[Prior Art] FIG. 6 is a block diagram of a conventional ring communication system. As shown in FIG.
A plurality of communication control devices IN1. IN.

IN, (When not explaining each communication control device separately,
(referred to as communication control device IN without a suffix) and a supervisor node 87 serving as a management node are mutually connected in a ring shape via a transmission path TL.

Here, one communication control device IN is for exchanging information with the terminal T and controlling communication between other communication control devices.

In addition to the functions of the communication control devices mentioned above, the supervisor node S collects transmission path quality information of all communication control devices and compares this information to search for sections where the quality is degraded. The reason for installing this supervisor node Sv is as follows. In other words, in a ring communication system, an error in a transmission path in a certain section affects the downstream side, so that the transmission path quality measured wt at a certain communication control device IN will be immediately changed to that between the communication control device one upstream. This is because, since it is not the quality of the transmission path, it is necessary to provide this supervisor node Sv to search for sections where the quality is degraded.

With the above-described configuration, the communication control device IN can communicate with the terminal T.
In addition to exchanging information with the other communication control devices IN, the supervisor node Sv also communicates with other communication control devices IN via the transmission path TL. During this time, the supervisor node Sv monitors the transmission quality of all communication control devices. There is.

[Problems to be Solved by the Invention] However, in the transmission path monitoring method in such a conventional ring communication system, as the scale of the system increases, the time required to monitor the quality of the transmission path increases. There is a problem.

The present invention aims to solve these problems by duplicating the transmission paths between the five communication control devices, so that each communication control device can monitor the quality of the transmission path between adjacent communication control devices. . The purpose is to provide a transmission path monitoring method in a ring communication system.

[Means for solving problems] FIG. 1 shows a block diagram of the principle of the present invention.

In Figure 1, IN, IN,, IN,, IN
.

are communication control devices, and these communication control devices IN, .

IN, IN, , IN constitute a ring communication system by being connected to each other via a transmission path TL.

Here, the communication control bag fiIN is for exchanging information with the terminal T and controlling communication between other communication control devices.

In addition, the transmission line TL connecting these communication control devices is
Duplicated first transmission lines TL with mutually different transmission directions
TL2 and a second transmission line TL2.

Furthermore, for example, the communication control device IN transmits the signal from the first transmission path TLIL2 between the adjacent communication control device IN□ to the second transmission path M between the adjacent communication control device IN□.
It is configured to loop back to TL2□.

In addition, the signal from the first transmission path TL11□ between the adjacent communication control device IN and the other adjacent communication control device 1
The second transmission line TL2.IN3. By comparing the error rate with the signals from , , , the quality of the transmission path between one communication control device IN, IN, , IN1 is monitored.

Note that TLI□ is the first transmission path between the communication control devices IN, , IN.

Also, another communication control device IN1. IN3. IN.

The communication control device IN2 also has the same configuration as the communication control device IN2.

[Operation] With such a configuration, a certain communication control device IN transmits a signal from the first transmission path TL112 between the adjacent communication control device i1N to this adjacent communication control device IN.
In addition, the signal from the first transmission line TL11□ between this communication control device IN2 and the adjacent communication control device IN□ is The quality of the transmission path between the communication control devices is monitored by comparing the error rate with the signal from the second transmission path TL232 between the communication control device IN3 and the other communication control device IN3.

In addition, other communication control devices IN, IN, IN.

also performs similar operations with adjacent communication control devices.

[Example] The present invention will be described in detail below with reference to one drawing.

(a) Description of the first embodiment FIG. 2 is a block diagram showing the first embodiment of the present invention. In this FIG. 2, IN, IN2. IN.

IN4 is a communication control device, and these communication control devices IN, IN, , IN are connected to each other via a transmission path TL to form a ring communication system.

Here, the communication control device IN is for exchanging information with the terminal T and controlling communication between other communication control devices.

In addition, the transmission line TL connecting these communication control devices is
Duplicated first transmission lines TL with mutually different transmission directions
TL2 and a second transmission line TL2.

Now, if we focus on the communication control bag M I N Z, for example, this communication control device IN2 transmits the signal from the first transmission path TL112 between the adjacent upstream communication control device IN to this upstream communication control device. Second transmission line TL between device IN and
It is configured to fold back to 2□1.

That is, as shown in FIG. 3, this communication control device IN2 includes a receiving circuit 1 that receives a signal from a first transmission path TL112 between it and the upstream communication control device IN1, and further includes a receiving circuit 1. is a second transmission line TL between the upstream communication control device IN and the communication control device IN via the return circuit 2.
221.

Here, the folding circuit 2 performs bit synchronization, word synchronization, or frame synchronization between both transmission lines.

Further, one communication control device 1IN2 transmits a signal from the first transmission path TL112 between the upstream communication control device IN1 and an adjacent downstream communication control device IN. By comparing the error rate with the signal from the second transmission path TL232, the quality of the transmission path between the communication control devices is monitored.

That is, as shown in FIG. 3, this communication control bag fiIN is a synchronization circuit that synchronizes after the receiving circuit 1 receives a signal from the first transmission path TL112 between it and the upstream communication control device IN. 4, a monitoring circuit 5 that calculates an error rate based on the out-of-synchronization signal generated by the synchronization circuit 4, and a communication control device IN on the downstream side.
The error rate is calculated based on the synchronization circuit 7 that synchronizes after receiving the signal from the second transmission line TL232 between the receiver circuit 6 and the synchronization circuit 7, and the out-of-synchronization signal generated by this synchronization circuit 7. and a comparison circuit 9 for comparing the error rates from the monitoring circuits 5 and 8.
It is equipped with

A display means 13 is provided on the output side of the comparator circuit 9 to display whether or not the transmission quality has deteriorated based on the difference in the input error rates.

In addition, in order to exchange information with the terminal T and to control communication between other communication control devices, a branch circuit 10 and an insertion circuit 1 are provided.
1 and a transmitting circuit 12 are provided.

Here, the branch circuit 1o transmits the signal from the synchronous circuit 4 to the terminal T.
The insertion circuit 11 inserts the signal from the terminal T into the transmission path, and the transmission circuit 12 sends the signal to the first transmission path T L 123 to the communication control device IN on the downstream side. It is something.

Note that the other communication control devices IN, IN, IN4 also have the same configuration as the communication control device IN2.

With the above-described configuration, the communication control device IN is activated again.

Considering this, the signal (data) received from the first transmission line TL112 passes through the loopback circuit 2 and is transferred to the second transmission line TL2.
□, is looped back to the communication control device IN1 on the upstream side, and passes through the synchronization circuit 4 to the monitoring circuit 5 and the branch circuit 10. It is sent to the insertion circuit 11. Here, the synchronization circuit 4 generates a synchronization signal necessary to operate the device, and the branch circuit 10. The insertion circuit 11 provides an interface with the terminal T, and if there is data to be transmitted to the terminal T, the 1-branch circuit 10 is used to branch the data to the terminal T,
If there is data from terminal T, the insertion circuit 11 is used to insert the data from terminal T into the transmission path.

Further, the monitoring circuit 5 calculates an error rate based on the out-of-synchronization signal generated by the synchronization circuit 4, and sends the result to the comparison circuit 9.

On the other hand, from the communication control device IN on the downstream side, the transmission line TL23
The signal returned through the receiving circuit 2 is sent to the synchronizing circuit 7 via the receiving circuit 6. The monitoring circuit 8 is the synchronous circuit 7.
An error rate is calculated based on the out-of-synchronization signal generated in , and sent to the comparison circuit 9 .

For example, if the error rate of the monitoring circuit 8 is higher than the error rate of the monitoring circuit 5, the comparison circuit 9 determines that the quality of the transmission path between the communication control bag 5tIN3 on the downstream side is poor and displays a display to that effect. The information is displayed on the means 12.

In addition, other communication control equipment IN engineering, IN3. IN4 also performs similar operations with adjacent communication control devices.

In this way, the quality of the transmission path between communication control devices can be monitored in real time regardless of the scale of the ring communication system, so it is possible to quickly respond to deterioration in transmission quality.

(b) Description of Second Embodiment FIG. 4 is a block diagram of a communication control device according to a second embodiment of the present invention. In FIG. 4, the same reference numerals as in FIG. 3 indicate substantially similar parts.

Now, in the case of this second embodiment, focusing on the fact that the transmission path between the communication control devices is duplexed, for example, if the quality of the transmission path to the downstream communication control device is poor, the upstream communication This attempts to secure communication by using a return transmission path to the control device.

That is, FIG. 4 shows, for example, the communication control device IN.

As can be seen from this FIG. It is now possible to send it to □.

Note that the switching control of the selector 14 is performed by a controller (not shown), but when the comparator circuit 9 detects that the quality of the transmission path between the communication control devices IN, IN3 is poor, the selector 14 is switched. The data from terminal T is sent to the upstream communication control device IN through
It is controlled so that it is sent to 1.

Then, while the data is being detoured in this way, the transmission path is repaired.

Therefore, according to the second embodiment, when transmission path quality deterioration is detected, high quality data communication can be ensured while avoiding this transmission path, and highly reliable communication services can be provided. .

Note that there are other communication control devices IN, IN,, IN.

also has the same configuration as the communication control device IN, and
Similar operations are performed between adjacent communication control devices.

(c) Description of Third Embodiment FIG. 5 is a block diagram of a communication control device according to a third embodiment of the present invention. In FIG. 5, the same reference numerals as in FIGS. show.

Now, in the case of this third embodiment as well, focusing on the fact that the transmission paths between the communication control devices are duplexed, for example, when the transmission path quality of the first transmission path TLI is poor, the second transmission path TL2
The aim is to secure communications using

That is, FIG. 5 shows, for example, the communication control device IN.

As can be seen from this FIG.
In addition, the signal from the insertion circuit 11 can be sent to the upstream side communication through the selector 14 interposed between the return circuit 2 and the transmission circuit 3. It is now possible to send it to the control equipment engineer.

Note that switching control of the selectors 14.16 is performed by a controller (not shown), but when it is detected from the comparator circuit 9 and other factors that the transmission path quality of the first transmission path TLI is poor, the selectors 14.16 are switched. data from the terminal T or other communication control device to the upstream communication control device IN□
It is controlled so that it is sent to.

During this time, the first transmission line is repaired.

Therefore, in the case of this third embodiment as well, when transmission path quality deterioration is detected, high quality data communication can be ensured while avoiding this transmission path, and highly reliable communication services can be provided. .

Note that other communication control devices INi, IN3. IN4 also has the same configuration as the communication control device IN2, and performs similar operations with adjacent communication control devices.

Note that, although common to each of the above-mentioned embodiments, for example, the communication control device shown in FIG. IN, the supervisor node S
In this case, for example, the detection result of the comparison circuit 9 is inserted through the insertion circuit 11, and this detection result is sent to the supervisor node Sv. It is possible to centrally manage the quality of the transmission path between each communication control device and display its status.

[Effects of the Invention] As described in detail above, according to the transmission path monitoring method in the ring communication system of the present invention, the transmission path between communication control devices has a duplex configuration consisting of a first transmission path and a second transmission path. ,
Each communication control device connects the first communication control device with an adjacent communication control device.
The configuration is such that the signal from the transmission path is looped back to the second transmission path between this adjacent communication control device, and the signal from the first transmission path between the adjacent communication control device and the other adjacent communication Since the quality of the transmission path between one communication control device is monitored by comparing the error rate with the signal from the second transmission path between the control device and the second transmission path, the quality of the transmission path between the communication control devices can be monitored in real time regardless of the scale of the ring communication system, which has the advantage of being able to quickly respond to deterioration in transmission quality.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the principle of the present invention, Fig. 2 is a block diagram showing a first embodiment of the invention, Fig. 3 is a block diagram of a communication control device in the first embodiment of the invention, and Fig. 4 is a block diagram of the communication control device in the first embodiment of the invention. FIG. 3 is a block diagram of a communication control device according to a second embodiment of the present invention. FIG. 5 is a block diagram of a communication control device according to a third embodiment of the present invention, and FIG. 6 is a block diagram showing a conventional example. In fig. 1 is the receiving circuit. 2 is a loopback circuit, 3 is a transmission circuit, 4 is a synchronization circuit, 5 is a monitoring circuit, 6 is a reception circuit, 7 is a synchronization circuit, 8 is a monitoring circuit, 9 is a comparison circuit, 10 is a branch circuit, 11 is an insertion circuit, 12 is a receiving circuit, 13 is a display means, 14 is a selector, 15 is a synchronization circuit, 16 is a selector, IN, , IN2. IN3. IN4 is the communication control device, SV is the supervisor node, T is the terminal, TL is the transmission line, TLI, TLI□,, TLI23 is the first transmission line, TL2
．． TL2□1. TL232 is the first transmission line. A (Mib River" / l! Steam) ゛Log country Figure 1 Book launch date @ (71 sheep 1 tiger delivery!") Σ Show blog log sub-floor column IE Show blog mouth Figure 6

Claims (3)

[Claims] (1) Multiple communication control devices (IN_1), (IN_2)
, (IN_3), and (IN_4) are connected in a ring shape via a transmission line (TL), the communication control devices (IN_1), (IN_2), and (IN_3
), (IN_4) is a duplexed first transmission line (TL1) with mutually different transmission directions.
) and a second transmission path (TL2), and the communication control device (IN_2) has an adjacent communication control device (IN_2).
The signal from the first transmission path (TL1_1_2) between the communication control device (IN_1) and the adjacent communication control device (IN_1) is looped back to the second transmission path (TL_2_2_1) between the adjacent communication control device (IN_1), and communication control device (IN
_1) between the signal from the first transmission line (TL1_1_2) and the signal from the second transmission line (TL_2_3_2) between the adjacent other communication control device (IN_3). A transmission path monitoring method in a ring communication system, characterized in that transmission path quality between the communication control devices is monitored by comparison. (2) A signal from the first transmission path (TL1_1_2) between the adjacent communication control device (IN_1) and the second transmission path (TL1_1_2) between the adjacent communication control device (IN_3)
By comparing the error rate with the signal from TL_2_3_2), the communication control device (IN_2)
and both adjacent communication control devices (IN_1) (IN_3)
If it is determined that the quality of one of the transmission paths between
The first transmission line (TL1_1_
2) and the second transmission path (TL2_2_1), the transmission path monitoring method in the ring communication system according to claim 1. (3) The communication control device (IN_1), (IN_2), (
The first transmission line (TL1) between IN_3) and (IN_4)
or the communication control device (I
N_1), (IN_2), (IN_3), (IN_4)
A transmission path monitoring method in a ring communication system according to claim 1, wherein communication is performed using one of the communication paths formed by connecting the second transmission path (TL2) between the rings. .